Bill Merrill on fri 4 jul 08
Here is a glaze that melts with a match. It is similar to old Japanese
glazes, originally made from the rock of the Kamo River in Japan. The
rock was lithium based. At one time potters were made to quit using the
rock and they stole headstones made from the rock to continue making the
glaze. This is a glaze from Richard Berhens from many years ago. =20
If you look at a list of frits, besides the ingredients the melting temp
of the frit is given. Each frit has it's own melting temp.
Cone 016 Like Old Japanese Raku
Frit P25 (Pemco) (leadless)43.6
Frit 3134 (ferro)(leadless high lime) 26.3
Lithium Carb 9.9 =20
Try copper washes on this glaze (veils of pale aqua and can flash red)
John on fri 4 jul 08
That glaze is a.k.a. Raku Turquoise with 3.5% Copper Carb. It is listed =
in Chappell's book.
He has about 15 color variants including Blue Silver, etc.